#428CB1#428CB1

#428CB1 is a mid, moderate cyan. Relative luminance 0.231; OKLCH L 60.9% C 0.092 H 232.9°. Best body text is #000000 at 5.62:1 contrast (WCAG AA passes).

Color values

HEX	#428CB1
RGB	rgb(66, 140, 177)
HSL	hsl(200, 46%, 48%)
HSV	hsv(200, 63%, 69%)
CMYK	cmyk(62.7%, 20.9%, 0%, 30.6%)
CIE-LAB	lab(55.16, -11.55, -26.30)
CIE-LCH	lch(55.16, 28.72, 246.30°)
OKLab	oklab(60.85% -0.0557 -0.0736)
OKLCH	oklch(60.85% 0.092 232.9)
XYZ	xyz(19.5576, 23.0868, 45.0120)
Luminance	0.2309 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428CB1 #B16742

analogous

#42B19E #428CB1 #4254B1

triadic

#428CB1 #B1428C #8CB142

tetradic

#428CB1 #9E42B1 #B16742 #54B142

square

#428CB1 #9E42B1 #B16742 #54B142

split-complementary

#428CB1 #B14254 #B19E42

monochromatic

#214558 #316984 #428CB1 #69A8C7 #96C2D8

Accessibility & contrast

On white

3.74

#428CB1 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.62

#428CB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428CB1

5.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428CB1	#FFFFFF	#000000	##000000
##428CB1	1.00	3.74	5.62	5.62
#FFFFFF	3.74	1.00	21.00	21.00
#000000	5.62	21.00	1.00	1.00
##000000	5.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#7A8AB3

Deuteranopia (green-blind)

#6A7FB0

Tritanopia (blue-blind)

#009698

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428cb1;
/* rgb */ color: rgb(66, 140, 177);
/* oklch */ color: oklch(60.9% 0.092 232.9);

Tailwind

colors: {
  custom: {
    50: '#81adc8',
    500: '#428cb1',
    950: '#000000',
  },
}

SCSS

$custom: #428cb1;
$custom-light: #81adc8;
$custom-dark: #000000;

JSON

{
  "hex": "#428cb1",
  "rgb": {
    "r": 66,
    "g": 140,
    "b": 177
  },
  "hsl": {
    "h": 200,
    "s": 45.679,
    "l": 47.647
  },
  "oklch": {
    "l": 0.60851,
    "c": 0.09228,
    "h": 232.9
  },
  "luminance": 0.23089
}

Semantic roles & 50–950 ramp

primary

#428CB1

secondary

#C39E8B

accent

#7E52D5

background

#F8FAFC

surface

#EFF4F8

border

#CACED1

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428CB1

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →